Coastal bathymetry data at Rapa Nui (Easter Island, Chile)

This archive contains files and bathymetry data from Rapa Nui (Easter Island, Chile), originating from echosounder data gathered in November 2022 and 2025. Depth was measured using a Biosonics MX echosounder [1], and surveys mostly focused on shallow depths (above 30m depth). This archive also contains extracts from GEBCO [2], Copernicus COP 30 [3], and nautical maps from SHOA [4], which are used to krige an interpolated bathymetry map at 30x30 m resolution. R code is provided to replicate the interpolation. List of files ALL_DEPTHS.rds and ALL_DEPTHS.tsv Echosounder data as an R data file containing a data frame, or as tab-delimited text data, with columns: data_file the original data file; local_time the local time of the record; utcsec the number of seconds since UNIX Epoch of the record (in UTC time); gps_quality The quality of the gps record (lower is better); lat, lon, UTM_X, UTM_Y coordinates of the record in WGS84 lon/lat (EPSG 4326) or UTM12S (EPSG 32712), respectively; bottom_depth The recorded depth, in meters gebco_2025_n-25.0_s-29.0_w-112.0_e-107.0.tif GEBCO Data extract for the area, used for kriging bathymetry output_COP30.tif The Copernicus COP30 dataset extract used for kriging bathymetry rapa_polygon.sqlite an sqlite database containing polygon data for Rapa Nui mainland and islets output/input_dataset.gpkg A geopackage data file containing all data points used for depth kriging output/rapa_coastal_bathymetry_rast.tiff A single band geoTIFF containing interpolated depth data at a 30x30m resolution (UTM12S; EPSG 32712) kriging_bathymetry.R, swissknife.R two R script files containing the code used to interpolate the bathymetry data pretty_export/export.png A rendering of the depth data export_version.txt The export version number LICENSE The license applicable to this dataset (CC0) License and disclaimer The echousounder data provided in this archive is provided under a CC0 License, available at https://creativecommons.org/publicdomain/zero/1.0/ and distributed in this archive in the LICENSE file. ALL DATA ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY KIND. IN NO EVENT THE AUTHORS CAN BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE DATASET (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES). Funding and partners This work was developed with local Rapa Nui partner Freddy Hereveri Tuki and in joint collaboration with Cristian Rapu Edmunds and Loti Garcia Haoa. Echosounder sampling was coordinated by Evie Wieters (Estacion Costera de Investigaciones Marinas, PUC, Chile) and Alexandre Genin (LISC, INRAE, France), with assistance from N. Riquelme, B. Salgado-Murillo, C. Montt Montecinos, F. Fuentes Campos. Freddy Hereveri provided feedback and co-designed the field sampling platform, while technical support and boat operations were provided by Freddy, Crisitian and Loti (ORCA dive center). Data analyses were conducted by Alexandre Genin. COP30 data were produced using Copernicus WorldDEM-30 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved GEBCO data are produced by the International Hydrographic Organization and UNESCO (https://www.gebco.net/). Funding This work was supported by the Chilean grant Fondecyt #124190 to EAW, and has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement N°896159. [1] https://www.biosonicsinc.com/products/mx-aquatic-habitat-echosounder/ [2] https://www.gebco.net/ [3] https://dataspace.copernicus.eu/explore-data/data-collections/copernicus-contributing-missions/collections-description/COP-DEM [4] https://www.shoa.cl/php/index.php本数据集归档包含来自智利拉帕努伊岛（复活节岛）的文件与水深地形数据，其原始数据为2022年11月与2025年11月采集的回声测深仪（echosounder）数据。水深测量采用Biosonics MX回声测深仪[1]完成，调查区域主要聚焦于30米以上的浅水区。 本归档同时包含GEBCO[2]、哥白尼COP30[3]数据集的提取数据，以及SHOA[4]的海图数据，上述数据用于克里金插值生成30×30米分辨率的水深地形地图。本归档提供了复现该插值过程的R代码。 ### 文件清单 ALL_DEPTHS.rds 与 ALL_DEPTHS.tsv：回声测深仪数据，分别为R数据格式（内含数据框）与制表符分隔文本格式，包含以下字段：data_file（原始数据文件名）、local_time（记录的本地时间）、utcsec（记录对应的UNIX纪元秒数，采用UTC时间）、gps_quality（GPS记录质量，数值越低质量越好）、lat、lon（记录的WGS84经纬度坐标，EPSG 4326）、UTM_X、UTM_Y（记录的UTM12S坐标系坐标，EPSG 32712）、bottom_depth（实测水深，单位为米）。 gebco_2025_n-25.0_s-29.0_w-112.0_e-107.0.tif：本研究区域的GEBCO数据提取文件，用于克里金插值水深数据。 output_COP30.tif：用于克里金插值水深数据的Copernicus COP30数据集提取文件。 rapa_polygon.sqlite：包含拉帕努伊岛主岛及附属小岛多边形数据的SQLite数据库。 output/input_dataset.gpkg：包含所有用于水深克里金插值的数据点的地理数据包（GeoPackage）文件。 output/rapa_coastal_bathymetry_rast.tiff：单波段GeoTIFF文件，包含30×30米分辨率的插值水深数据，坐标系为UTM12S（EPSG 32712）。 kriging_bathymetry.R、swissknife.R：两个R脚本文件，包含用于插值水深数据的代码。 pretty_export/export.png：水深数据的可视化渲染图。 export_version.txt：导出版本号文件。 LICENSE：本数据集适用的许可协议（CC0）。 ### 许可与免责声明 本归档中提供的回声测深仪数据采用CC0许可协议发布，协议文本可访问https://creativecommons.org/publicdomain/zero/1.0/查看，本归档的LICENSE文件中亦包含该协议全文。 本数据集所有数据均按“现状”提供，不附带任何形式的明示或默示担保。在任何情况下，作者均不对因使用或无法使用本数据集而产生的任何损害（包括但不限于一般性损害、特殊性损害、偶发性损害及衍生性损害）承担责任。 ### 资助与合作团队 本研究与拉帕努伊岛本地合作伙伴Freddy Hereveri Tuki合作开展，并与Cristian Rapu Edmunds及Loti Garcia Haoa联合协作。回声测深仪采样工作由Evie Wieters（智利天主教大学海岸海洋研究站）与Alexandre Genin（法国国家农业食品与环境研究院LISC实验室）统筹，N. Riquelme、B. Salgado-Murillo、C. Montt Montecinos、F. Fuentes Campos提供协助。Freddy Hereveri提供反馈并共同设计了野外采样平台，技术支持与船舶运营由Freddy、Crisitian与Loti（ORCA潜水中心）提供。数据分析工作由Alexandre Genin完成。 Copernicus COP30数据基于Copernicus WorldDEM-30制作，版权归© DLR e.V. 2010-2014与© Airbus Defence and Space GmbH 2014-2018所有，由欧盟与欧洲空间局（ESA）根据哥白尼计划提供；保留所有权利。 GEBCO数据由国际海道测量组织与联合国教科文组织制作，详情可访问https://www.gebco.net/。 ### 资助信息 本研究得到智利Fondecyt项目编号#124190（资助方EAW）的支持，并获得欧盟地平线2020研究与创新计划下玛丽·斯克沃多夫斯卡-居里行动协议编号N°896159的资金资助。 [1] https://www.biosonicsinc.com/products/mx-aquatic-habitat-echosounder/ [2] https://www.gebco.net/ [3] https://dataspace.copernicus.eu/explore-data/data-collections/copernicus-contributing-missions/collections-description/COP-DEM [4] https://www.shoa.cl/php/index.php